xyntec

I do not have SOC lights on the batteries, they are Growatt ARK2.5H A1 batteries and are meant to connect to the GroWatt BMS which has a minimum of 3 batteries to work, and a maximum of 10 batteries. It is a system like in below picture (although there are only 2 batteries in the picture which would not be possible I think)

strange enough I removed the 2 new batteries yesterday, and now everything works perfectly again, after using all night on the batteries, the capacity was still at 50% this morning. So for some reason when I change the capacity from 7,5kWh to 12,5kWh the BMS doesn't charge/discharge correctly anymore. I don't understand why, there is no setting adjustment needed as far as I know, and the battery voltage is detected immediately by the BMS when connecting the 2 extra batteries (goes from 156V to 263V), and the individual batteries measure over 50V, so all seems okay. Still with 5 batteries nothing really works anymore. This morning: Way different than yesterday...

they are all linked with ethernet cable which is supplied with the batteries, I would suppose the inverter or the BMS would give some kind of error if there was something wrong or not communicating. Anyway it is getting worse, today at 12 at night it was still around 90%, then it lasted only 1 hour before dropping to 10%. The SOC is the same both in the app as on the web interface. using only around 200W

I have installed 3 ARK2.5H batteries together with the Growatt BMS and a SPA10000TL3 BH-UP inverter in my house. I already had a single phase SolarEdge solar panel system HDwave 4kW, (unfortunately not possible to have a 3 phase system because I could not install enough panels at the time). This worked fine together, the Growatt charges the batteries when my current from the grid is negative (during the day when there is sun), and discharges at night. I have checked this for a few weeks and works perfect, the Growatt keeps the use at 0W by feeding back into the grid at the same time. I recently added a 4th battery to make it a 10kW system, and although I didn't check it as often as before, everything seemed to work fine. Most of the time still had enough capacity left in the morning. So now this week I added a 5th battery to make a total of 12,5kW, but now in the morning the batteries were completely depleted. Strange enough when I went to bed the capacity was at 81%, and while using about 220W continuously during the night, at around 4 oclock in the night the battery level completely dropped to 10% while at that time it should have used max around 1,5kWh total. I checked today during charging, and as it slowly rose to around 36%, it suddenly jumped to a 100%. I have no idea why this now happens. The voltage is correct at 265V total for 5 batteries. I also disconnected the last battery to test, but it didn't change a thing, except for lowering the voltage to around 210V. Anyone an idea on how to solve this?